High-voltage transformer.



HGH VLTGE TRANSFORME.

APPLIGATIQN FILED 00T.1o,1906

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Witrweg n fr @mi UNITED STATES PATENT OFFICE.

JOHN B. TAYLOR, OF SCHENE'CTADY, NEW YORK, ASSIGNOR 'ro GENERAL ELECTRIC COMPANY, A-CD'RPORATION OF NEW YORK.

HIGH-VOLTAGE TBANSFOHMER.

Specification of Letters Patent.

g Patented Hay 28, 1907.

- 'Application filed October 10, 1906. 387121K@ 338,200.

l useful Improvements in High-Voltage Transformers, of which the following is a specification.

My invention relates to high-voltage transformers, and its'object is to provide a novel arrangement of the high-voltage winding for such transformers, so as to guard a fainst over-heating and burn-outs due to oscil ato high-frequency current. In extra high-vo tage transformers, especially those which are used for wireless telegraphy, hi h potential i testing pur oses, etc., and whic are consequently lia le to be connected to circuits in which there is a spark-gap, the high-voltage winding is subjected t'o a current which in part of the circuit may be oscillatory in character, which means that the value of the curront in ainperes in that part of the circuit may be appreciably greater than that inother parts of the winding. To guard against over-heatin duc to this oscillatory current, VI arrange lie high-voltage,winding with larger conductors near its terminals'and smaller conductors near its center.

My invention will best be understood by reference to the accompanyingdrawings, in which Figure 1 shows a view, partly in cross-section, of a transformer arranged in accordance with my invention; and Fig. Z is an explanatory diagram. L

Referring first to Fig. 2, A represents the low-voltage primary winding of a transformer, and A the high-voltage secondary winding, the terminals of which are connect-A cd to a spark-ga B with the condenser C 1nv parallel therewit i. Upon a discharge occurring across the gap B, a high frequency oscillatory current will flow, with the result that if animeters a and a are connected in series with the primar and secondary windings,

I respective y, uni er the conditions of oscillatory discharge the two ammeters will not register currents roportional to the numbers of turns of tlic two transformer windings, but the reading ofthe ammeter a/ will be reatl increased.

slow i the condenser C. be omitted, there may still be a great increase of current at the terminals 'of the high-voltage transformer, due to the electrostatic capacity of the winding itself and of the rest of the circuit.'4

Since, under these conditions, the terminal portions of the winding A -are acting asa.

condenser and supplying the oscillatory current. The current in these terminal portions is much greater than the current at the center of the winding. In order to guard against over-heating due to this oscillatory current without' greatly increasing the size of the transformer, I arrange the high-voltage winding, as shown in Fig. 1. In this figure the primary and secondary coils A and-A are shown mounted on t-lie laminated magnetic core I). For the sake of clearness, the hi vhvoltage winding Ais shown with asma ler number of turns than it would ordinarily have in practice.

Sections the smaller conductors being at the central part of lthel winding and the larger conductors near the terminals. The effective cross-se'ction of the winding thus gradually increases from the center to the terminals, and the increased, terminal cross-section enables the transformer to carry without over-heating the oscillatory currents, that have been described.

'lhis high-voltage winding. is composed of' conductors of different cross- I do not desire to limit myself to the paru ticular construction and arrangement of arts here shown, but aim in the a to cover all modifications w ich are within the scope of my invention. i

What I claim as new and' desire to secure by Letters Patent of the United States,is,-

l. In la transformer, a high-voltage -winding having a greater effective cross-section nearl its terminals than near its center.

2. In a transformer, a high-voltage windin having an efective cross-section graduallgy increasing from its center toward its terminals. 1

3. `In a transformer, a high-voltage winding having its end turns formed of a larger conductor than its center turns,

In witness whereof, I have hereunto set my ,hand this Sth day of October, 1906.

. JOHN B. TAYLOR. Witnesses .BENJAMIN B. HULL,

HELEN ORFORD.

ended c aims 

